-module(mcp_toolkit@transport@rpc).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/mcp_toolkit/transport/rpc.gleam").
-export([process_http_rpc/3, handle_http_rpc/3]).

-file("src/mcp_toolkit/transport/rpc.gleam", 30).
-spec process_http_rpc(
    gleam@http@request:request(mist@internal@http:connection()),
    mcp_toolkit@core@server:server(),
    integer()
) -> gleam@http@response:response(mist:response_data()).
process_http_rpc(Req, Server, Max_body_bytes) ->
    case mist:read_body(Req, Max_body_bytes) of
        {ok, Read_req} ->
            Body = begin
                _pipe = gleam@bit_array:to_string(erlang:element(4, Read_req)),
                gleam@result:unwrap(_pipe, <<""/utf8>>)
            end,
            case mcp_toolkit:handle_message(Server, Body) of
                {ok, {some, Json}} ->
                    mcp_toolkit@transport@util:json_response(
                        200,
                        gleam@json:to_string(Json)
                    );

                {error, Json} ->
                    mcp_toolkit@transport@util:json_response(
                        200,
                        gleam@json:to_string(Json)
                    );

                {ok, none} ->
                    _pipe@1 = gleam@http@response:new(204),
                    gleam@http@response:set_body(
                        _pipe@1,
                        {bytes, gleam@bytes_tree:new()}
                    )
            end;

        {error, _} ->
            mcp_toolkit@transport@util:json_response(
                400,
                begin
                    _pipe@2 = gleam@json:object(
                        [{<<"error"/utf8>>,
                                gleam@json:string(<<"invalid body"/utf8>>)}]
                    ),
                    gleam@json:to_string(_pipe@2)
                end
            )
    end.

-file("src/mcp_toolkit/transport/rpc.gleam", 14).
-spec handle_http_rpc(
    gleam@http@request:request(mist@internal@http:connection()),
    mcp_toolkit@core@server:server(),
    integer()
) -> gleam@http@response:response(mist:response_data()).
handle_http_rpc(Req, Server, Max_body_bytes) ->
    Allowed = [<<"POST"/utf8>>, <<"OPTIONS"/utf8>>],
    case erlang:element(2, Req) of
        post ->
            process_http_rpc(Req, Server, Max_body_bytes);

        options ->
            _pipe = gleam@http@response:new(204),
            _pipe@1 = gleam@http@response:set_header(
                _pipe,
                <<"Allow"/utf8>>,
                mcp_toolkit@transport@util:string_join(Allowed)
            ),
            gleam@http@response:set_body(
                _pipe@1,
                {bytes, gleam@bytes_tree:new()}
            );

        _ ->
            mcp_toolkit@transport@util:method_not_allowed(Allowed)
    end.